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父子之间要亲爱,君臣之间要有礼义,夫妇之间要挚爱但还要有内外之别,老少之间有尊卑之序,朋友之间要有诚信之德。
Expertise in any domain involves the automation of basic skills, freeing attention for higher-level aspects of performance.
The mathematician's best work is art, a high perfect art, as daring as the most secret dreams of imagination, clear and limpid.